cksum.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: cksum.so,v 1.4 2004/09/28 14:13:08 bostic Exp $])

m4_ref_title(Upgrading m4_db Applications,
    Release 4.2: DB_CHKSUM_SHA1,,
    upgrade.4.2/queue, upgrade.4.2/client)

m4_p([dnl
The flag to enable checksumming of m4_db databases pages was renamed
from DB_CHKSUM_SHA1 to m4_ref(DB_CHKSUM), as m4_db uses an internal
function to generate hash values for unencrypted database pages, not
the SHA1 Secure Hash Algorithm.  m4_db continues to use the SHA1 Secure
Hash Algorithm to generate hashes for encrypted database pages.
Applications using the DB_CHKSUM_SHA1 flag should change that use to
m4_ref(DB_CHKSUM); no other change is required.])

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